Multiple-impeller pump.



A. E. GUY.

MULTIPLE IMPBLLER PUMP.

APPLICATION FILED APR. 30, 1908.

Patented Feb.l6,190 9.

3 SHEETSSHEET 1.

. GUY.

MULTIPLE IMPELLER PUMP.

APPLICATION FILED APR. 30, 1908.

Patented Feb. 16, 1909.

3 SHEETS-SHEET 2.

3 6 s 5 6 n m A. E. GUY.

MULTIPLE IMPELLER PUMP.

APPLICATION FILED APR.30,1908.

912,954, Patented Feb. 16, 1909.

3 SHEETS-SHEET 3.

3 :FQILQQ y %M(.%ffxw M Atty.

' UNITED STATES PATENT OFFICE.

ALBERT GUY, OF TRENTON, NEW JERSEY, 'ASSIGNOB 'lO DE LA'VAL STEAM TURBINE COMPANY, F NEW YORK, N. Y., .A CORPORATION-OF NEW JERSEY.

MULTIPLE-WELLER PUMP.-

Specification of Letters Patent.

Patent ed Feb. 16, 1909.

Application filed April 30, 1908. Serial No. 430,045.

' 1 ering into the same receiving chamber.

My invention also comprises means preventing the current delivered by the impeller or impellers on one shaft from opposing the current delivered by the impeller or impellers on the other shaft.

In applicationSr. No. 401,929, filed November'13, 1907 ,'I haveillustrated and described a multi 'le impeller pump, wherein a single driving sliaft has upon it a plurality of impellers operating in parallel within a common delivery chamber; and I have there pointed out how such arrangement of the impellers and the corresponding arrangement of the supply and delivery chambers of the casing, simplifies the construction of" multipleimpeller pum s and how according tothis construction t e casings of such pumps may be made of standard sizes and construction, the pumps being adapted to different conditions by mere substitution of diflerent impellers. In application Sr. No. 401,930 filed N ovember 13, 1907, I have shown how such pumps may be adapted readily to different conditions by the provision of diffuser rings which may be of diflerent forms according to different conditions to be met, all forms of a particular series adapted, however, for use in the same casing and with the same or different impellers.

Instead of having the impellers on the same shaft it is often convenient to have them on different shafts, these shafts being usually parallel. This is particularly true where it is desirable to use more than two impellers operating in parallel. T 0 provide more than two impellers on the same shaft, all operating within the same delivery chamber and all drawing directly from the same source, would involve oonsi( erable complica tionsin the arrangement of passage within 1 the casing; whereas the arrangement of passages required by two impellers on the same shaft is exceedingly simple. W here there are to be two or more parallel shafts each carrying but two impellers, these im ellers intended all to work in parallel, su stantially the same arrangement of passages may be employed as when there is only one shaft with two impellers thereon, the form only of the passages or chambers requiring to be changed to provide room for the reception of two or more parallel shafts and the impellers thereon. Furthermore, the use of two or more driving shafts each carrying impellers is particularly desirable when the pump is of such size as to require considerable power to drive it, and it is to be driven by axial flow turbines. In such turbines it is common to employ speed reduction gearing, the turbine shaft carrying a pinion and the pinion drivin a gear on the driving shaft of the m achine; and where the turbine is of lar e size it is customary to provide two such riving shafts on opposite sides of the turbine shaft and each carryin a gear driven by the pinion on the tur ine shaft; side pressure And where very large powers are desired, two turbinesmay be employed arranged side by side, the turbine shafts carrying pinions which dfive three driving shafts, as explained in a companion application of even date. 'It is convenient in such cases to mount the impellers of the pump on these drivin shafts or on other shafts directly couple thereto; hence it is particularly true of pumps to be driven by such turbine motors, that it is desirable to rovide the ump with two or more im cl er shafts eac 1 of which shafts is rovidet with an impeller or impellers, these impellers all revolving within the same receiving chamber.

Where the pump is to be driven at high speed, (as where it 1s to be directly connected to a turbine motor) it is preferable to provide a number of relatively small impellers rather than to employ one 'or two lar 'er impellers, as the smaler impellers can e driven at higher rotative speeds and operate with less friction.

In the accompan ing drawings I illustrate a pump such as re erred to, also said pump combined with a turbine motor having two driving shafts. I v

In said drawings: Figure 1 shows atop on the shafts being thereby counterbalanced.

' moved, and shows in section certain diffuser walls 0 duct H and in the inner walls of -ated by the fact that water is drawn equally view of a two-shaft pump such as described ,;O serve to 'prevent conflict between the the upper section of the pump casing con [stream of fluid discharged by impellersA and taining the main portion of the delivery U and by impellers B and D and are suitably chamber, having been removed. l'ig. 2 curved to that end.

shows a vertical section of the pump on the l 1n ldig. 5, which shows the combined turline 2 2 of rig. 2, being a line through the bine andpump, P designates a steam turcenters of the supply and delivery openings I bine of well known type, Q a turbine shaft, and the central suction duct H. big. 25 shows R-R reverse spiral pinions on said shaft, a transverse section on the line 3-3 of lig. 4, that is to say, on a plane through the axis 3 of one of the shafts. J. ig. 4 shows a vertical section on the irregular line 244;2 of l ig. 1. l ig. 5 snows a top view of the pump combined with a two-shaft turbine motor, the upper portion of the pump casing having been removed as in i ig. 1, the upper portion of the gear casing of the turbinenaving been removed and the turbine being shown in central horizontal section and more or less diagrammatically. lig. 6 shows a detail top view of an impeller and the portions of the casing in immediate proximity thereto, the upper section of the casing having been reon shafts 5 and 6 respectively which are the same shafts which carry the pump im ellers.

Since, in the case of turbines 0 large power, it is desirable to have gears such as b-S on both sides of the turbine pinions R, to avoid si'de pressure upon the plnions and turbine shaft, it is particularl advantageous, in the case of a pump to be dli'iven by such a turbine, to have impellers mounted upon both said shafts and within a common casing, as shown.

if desired, the turbine casing may be provided with diffuser rings forming between charged from the impellers passes to the delivery chamber G and in which the kinetic energy of the rapidly moving stream of fluid discharged from the impeller is converted into pressure in the delivery chamber. Fig.

rings surrounding the impeller and hereinafter referred to.

Referring first to Figs. 1-4 inclusive, A and B designate like im ellers mounted upon a driving shaft 5, an 0 and D designate other like impellers mounted upon the parallel shaft 6; said shafts are journaled in the outer walls 8 and 9 of the suction ducts or supply passages E and l. Between these suction ducts there is a third suction duct H; and between ducts E and H, and 1* and H, are parts of the delivery chamber G, another portion of which, connecting these portions with each other, is in the upper part of the casing, and which is provided with an outlet J. 1 designates the common inlet to the three suction ductsE, 1 and H.

The impellers are seated and rotate in circular o enings formed respectively in the construction shown in my said application Sr. No. 401,930. T-T designate two such diffuser rings which surround the hubs of the impeller, here designated b letter A, and seated in the orifices of a jacent walls of passages E and H; the impeller revolving in these rings, instead of in hearings in the walls of chambers E and H, as in the construction shown in Fig. 1. By employing diffuser rings of different forms, with or without changing the form of the impeller, the pump may be adapted, without change of the casing, to operate most efficiently under a cat variety of different conditions. While ig. 6 shows only one impeller and the parts of the casing immediately adjacent thereto, and the diffuser rings, it will be obvious that all of the im ellers may be rovided with such rings an will commonly e so provided when for any reason the diffuser rings are desired.

What I claim is: y

1. A multiple impeller pump comprising in combination a plurality of impeller shafts, and impellers thereon and a casing having suction passages for the said impellers and a common delivery chamber for all of said impellers inclosin them and receiving their simultaneous disc arge. i

2. A multiple impeller pump comprising in combination a plurality of impeller shafts,

ducts E and F. It will be seen that, shafts 5 and 6 being in rotation, the impellers A and C draw liquid from ducts E and H and deliver into chamber G; end thrust being obvifrom both sides of the impeller. Similar] im ellers B and D draw from ducts F and and deliver into chamber G.

In the delivery chamber G is a depending guide N between impellers A and (I, and a similar guide 0 between impellers B and D, the u per portion a of each gpide being integra with the upper section of the casing of the pump, the lower ortion I) being lntegral with the lower sectlon L of the caslng; and screw bolts 0 serve to connect the sections K and L at this point. The sections K and L also have the customa1 meeting flanges as shown for exam le at and are provided with the usual be t holes for fastenmg the sections together. The guides N and all said impellers constructed to operate in arallel, and a casing having suction passages or said impellers and a common delivery chamber for all of said impellers inclosing 6 shows this construction, being the same.

and SS corresponding reverse spiral gears them passages through which the fluid diseach rovided with a plurality of impellers,

them and receiving their simultaneous diseach having two impellers thereon, said impellers all arranged to o erate in parallel, and a pump casing having t 1166 suction passages, one of which is intermediate the impellers of each shaft and the others of which are outside of the impellers of each shaft, said casing having also a common delivery chamber for all of said impellers inclosing them and receiving their simultaneous dlscharge, the portions of said delivery chamber within which said impellers revolve being between the intermediate suction passage and the outside suction passages.

4. A multiple impeller pump comprising in combination a lurality of impeller shafts and impellers t ereon, a casing having suction passages for said impellers, and a common delivery chamber for said impellers inclosing them and receiving their simultaneous discharge, andhaving also uiding 'means between the impellers of different,

shafts, serving to reduce conflict between the streams from such im ellers.

In testimony whereof I ave signed this specification in the presence of two subscribing Witnesses.

ALBERT E. GUY. Witnesses:

H. M. MARBLE, FRANK E. HOFFMAN. 

